PBDB Timescale

International Chronostratigraphic Timescale

The interval definitions in this timescale are derived from the following sources:

K. M. Cohen, S.C. Finney, P.L. Gibbard and J.-X. Fan. 2023. The ICS International Chronostratigraphic Chart v2023/09. view
F. M. Gradstein, J. G. Ogg, M. D. Schmitz and G. M. Ogg. 2020. Geologic Time Scale 2020 view
F. M. Gradstein, J. G. Ogg, and A. G. Smith. 2004. A Geologic Time Scale 2004 1-589 view
W. B. Harland, R. L. Armstrong, A. V. Cox, L. E. Craig, A. G. Smith and D. G. Smith. 1990. A Geologic Time Scale 1989. view

There are 59 timescales which overlap this one. show

Interval boundaries marked with * have been interpolated based on the differences between the ages for international timescale boundaries quoted in the source and the currently accepted ages for those boundaries.

Interval names marked with † are no longer in current use.

This timescale is used in the definition of 127777 collections

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International Chronostratigraphic Timescale					Silurian of the Baltic	Cambrian of China		Permian of China	Precambrian of Russia	Cambrian of Britain		Permian Subages of Germany	Ordovician of Ibero-Bohemia				Cambrian of North America		Carboniferous of North America	Devonian of Germany
Phanerozoic	Paleozoic	Permian	Lopingian	Changhsingian				Meishanian				Buntsandstein									251.902
				Changhsingian				Baoqingian													253.4 *
				Wuchiapingian				Laoshanian													254.14
				Wuchiapingian				Laibinian													257.7 *
			Guadalupian	Capitanian				Lengwuan				Ohre/Aller									259.51
				Wordian				Kuhfengian				Leine									264.28
				Roadian				Kuhfengian													266.9
			Cisuralian	Kungurian				Luodianian													273.01
				Artinskian				Luodianian													283.5
				Artinskian				Longlinian													285.4 *
				Sakmarian				Longlinian													290.1
				Asselian				Zisongian											Bursumian †		293.52
		Carboniferous	Pennsylvanian	Gzhelian				Zisongian											Virgilian		298.9
				Gzhelian															Virgilian		300.1
				Kasimovian															Missourian		303.7
				Kasimovian															Desmoinesian		305.9 *
				Moscovian															Desmoinesian		307
				Moscovian															Atokan		312.7 *
				Bashkirian															Atokan		315.2
				Bashkirian															Morrowan		318.4 *
			Mississippian	Serpukhovian															Chesterian		323.2
				Visean															Chesterian		330.9
																			Meramecian		335.8 *
																			Osagean		343.1 *
				Tournaisian															Osagean		346.7
				Tournaisian															Kinderhookian		351.9 *
		Devonian	Late Devonian	Famennian																Wocklum/Dasberg/Hemberg/Nehden	358.9
			Late Devonian	Frasnian																Adorf	372.2
			Middle Devonian	Givetian																Givetian	382.7
			Middle Devonian	Eifelian																Eifelian	387.7
			Early Devonian	Emsian																Emsian	393.3
				Pragian																Siegen	407.6
				Lochkovian																Gedinnine	410.8
		Silurian	Pridoli		Ohesaare																419.2
			Pridoli		Kaugetuma																421.7 *
			Ludlow	Ludfordian	Kuressaare																423
				Ludfordian	Paadla																423.4 *
				Gorstian	Paadla																425.6
			Wenlock	Homerian	Rootsikula																427.4
				Homerian	Jaagarahu																429.2 *
				Sheinwoodian	Jaagarahu																430.5
				Sheinwoodian	Jaani																431.8 *
			Llandovery	Telychian	Jaani																433.4
				Telychian	Adavere																434 *
				Aeronian	Adavere																438.5
				Aeronian	Raikkula																439.4 *
				Rhuddanian	Raikkula																440.8
				Rhuddanian	Juuru																441.4 *
		Ordovician	Late Ordovician	Hirnantian									Kosovian								443.8
				Katian									Kralodvorian	Bohdalec †							445.2
				Katian									Berounian								449.7 *
				Sandbian																	453
															Zahorany †/Vinice	Letna †					456.2 *
														Liben †							458 *
			Middle Ordovician	Darriwilian																	458.4
													Dobrotivian								458.5 *
													Oretanian								459.7 *
														Sarka †							461.7 *
				Dapingian										Klabava †							467.3
				Dapingian									Arenigian								468
			Early Ordovician	Floian									Arenigian								470
			Early Ordovician	Tremadocian									Tremadocian								477.7
		Cambrian	Furongian	Stage 10		Niuchehean	Taoyuanian †			Merioneth	Dolgellian/Trempealeauan							Franconian †/Dresbachian/Millardan			485.4
											Dolgellian/Trempealeauan						Sunwaptan				487.5
Festiniogian	489.2 *
	Jiangshanian			Jiangshanian		489.5
						Steptoean			493 *
Maentwrogian									493.1 *
	Paibian			Paibian					494
	Paibian			Paibian			Waergangian †/Youshuanian		494.9 *
Miaolingian	Guzhangian		Guzhangian	Wangcunian †		St Davids			Marjumian	Albertian †	497
	Drumian		Drumian	Wangcunian †					Marjumian		500.5
	Wuliuan		Wuliuan/Taijangian						Topazan		504.5
	Wuliuan		Wuliuan/Taijangian						Delamaran		506.5
Series 2	Stage 4		Duyunian			Caerfai			Delamaran	Waucoban †	509
	Stage 4		Duyunian						Dyeran		511 *
	Stage 3		Nangaoian						Dyeran		514
								Montezuman	514.8 *
								Begadean	519.9 *
Terreneuvian	Stage 2		Meishucunian						521
	Fortunian		Meishucunian						529
	Fortunian		Jinnigian						530.7
Proterozoic	Neoproterozoic	Ediacaran							Vendian								538.8
		Cryogenian															635
		Tonian															720
		Tonian							Karatau								800
	Mesoproterozoic	Stenian							Karatau								1000
		Stenian							Yurmatian								1100
		Ectasian							Yurmatian								1200
		Ectasian							Burzyan								1375
																					1400